Under guide for printing-machines



2 Shet-Sheet 1.

(No Model.) 8

W. K. HQDGMAN;

- UNDER GUIDE FOR PRINTING MACHINES. No. 340,785. Patented Apr. 27, 1886.

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2 SheetsF-Sheet 2.

(No Model.)

' W. K. HODGMAN.

UNDER GUIDE FOR PRINTING MACHINES. No. 340,785. Patented Apr, 27, 1886.

UNITED STATES PATENT OFFICE.

\VlLLIS K. IIODGMAN, OF TAUNTON, MASSACHUSETTS.

UNDER GUIDE FOR PRINTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 340,785, dated April 27, 1886,

(No model.)

To aZZ whom it may concern:

Be it known that l, \VILLIS K. I-IODGMAN, of Taunton, in the county of Bristol and State of Massachusetts, have invented a new and useful Improvement in Under Guides for Printing- Machines, which improvement or invention is fully set forth and illustrated in the follow ing specification and accompanying drawings.

My invention relates to certain improvements in that class of printing-presses in which the impression-cylinder is a continuously-rotating cylinder and arranged to take an impression at every turn.

In all printing-presses having continuously rotating impression-cylinders the sheet to be printed is laid upon the feed-board, its front edge being supported in position to be clamped by the cylinder-grippers by narrow pieces of sheet steel, which are fastened to and project out from the feed-board. These pieces of sheet steel are called under guides. The free ends of the front guides rest upon the under guides and prevent the sheet from sliding onto the impression-cylinder until the proper moment, when they are raised out of the way and the sheet allowed to slide off the under guides and onto the impression-oylinder.

My invention consists of raised ribs, which encircle the impression-cylinder from about the tail end of its impressionsurface to about the gripper-edge of the same, and serve to support the front edge of the sheet in a perfectlystraight line at exactly the same height as the impressioil-surface, thus obviating any tendency of the sheet to puff up when it is clamped over the under guides. I attain this object by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a vertical section of .a machine embodying my invention on the line :0 00, Fig. 2. Fig. 2 is a vertical section of the same on the line y y, Fig. 1. Fig. 3 is aplan of the machine.

Similar letters refer to similar parts throughout the several views.

A A are the side frames, and, together with the foundation l3, constitute the frame-work of the machine.

0 is the impressioncylinder mounted on the shaft D.

e is the deliverycylinder mounted on the shaft 6.

I I are a tight and loose pulley, which, by means of the driving-shaft Gr and driving-pinion G", transfer motion to the impression-cylinder gear G, which is fastened on one end of the shaft D, and which meshes with the delivery-cylinder gear G, which is fastened on one end of the shalt e.

Fis the feed-board, and S is the sheet which is about to be taken by the impression-cylinder grippers.

g are the iinpression-cylindcr grippers.

G is the impressionsurface, upon which the sheet S lies while being printed.

c are the delivery-cylinder grippers, and take the sheet from the impressioncylinder grippers g and convey it to the fiy-tapes t, which carry it over the fly. (Not shown.)

fare the front guides, and rock on the frontguide shaft f sufficiently to allow the sheet S to pass under their free ends at the proper time.

f is the front-guide lever, upon the free end of which is the roll f which engages with the flange-camf, (shown in dotted lines in Fig. 1,) and operates to lift the free ends of the front guides,f, at the proper time.

U are the raised ribs, which support the front edge of the sheet S before it is clamped by the grippers 9.

U are pieces bolted to the flange of the cylinder O, and serve to extend the ribs U nearer to the tail and gripperedge of the impressionsurface 0.

Operation: In Fig. l I have shown the machine in position when the sheet S is about to be taken by the impression-cylinder grippers g. The sheet S is supported in position to be taken by the grippers g by the raised ribs U and their extensions U, and is held from sliding onto the cylinder 0 before the proper time by the front guides, f, which are cut out so as to fit over the raised ribs U. (See Fig.2.) Astheimpression-cylinderCrevolves in the direction shown by the arrow, the roll f on the free end of the lever f comes in contact with the flange-cam f, causing the free ends of the front guides, f, to lift sufliciently to allow the sheet S to pass underneath. At the same time the grippers g are closed onto the edge of the sheet S by any well-known means. (Not shown.) As the cylinder 0 continnes to revolve, the sheet S is printed, then [5 what I claim as new,

taken by the delivery-cylinder grippers c and finally delivered to the fly (not shown) by the tapes t. Shortly after the tail end of the sheet S has passed under the free ends of the front 5 guides, f, the roll f comes to the end of the flange-cam f, and the front guides again close Over the raised ribs U, ready to hold another sheet in position.

I am aware that prior to my invention stop- [0 cylinders have been made with under guides fastened to the cylinders, and I do not wish to be understood as laying claim to such construction; but,

Having thus fully described my invention, and desire to secure by 7 Letters Patent, is

1. Inaprinting-presshavingacontinuously 

